JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container">

  <div class="options">
    <div class="option">
      <input type="checkbox"> Option
    </div>
    <div class="option">
      <input type="checkbox"> Option
    </div>
    <div class="option">
      <input type="checkbox"> Option
    </div>
    <div class="option">
      <input type="checkbox"> Option
    </div>
    <div class="option">
      <input type="checkbox"> Option
    </div>
    <div class="option">
      <input type="checkbox"> Option
    </div>
    <div class="option">
      <input type="checkbox"> Option
    </div>
    <div class="option">
      <input type="checkbox"> Option
    </div>
    <div class="option">
      <input type="checkbox"> Option
    </div>
    <div class="option">
      <input type="checkbox"> Option
    </div>
    <div class="option">
      <input type="checkbox"> Option
    </div>
    <div class="option">
      <input type="checkbox"> Option
    </div>
    <div class="option">
      <input type="checkbox"> Option
    </div>
    <div class="option">
      <input type="checkbox"> Option
    </div>
    <div class="option">
      <input type="checkbox"> Option
    </div>
    <div class="option">
      <input type="checkbox"> Option
    </div>
    <div class="option">
      <input type="checkbox"> Option
    </div>
    <div class="option">
      <input type="checkbox"> Option
    </div>
    <div class="option">
      <input type="checkbox"> Option
    </div>
    <div class="option">
      <input type="checkbox"> Option
    </div>
    <div class="option">
      <input type="checkbox"> Option
    </div>
    <div class="option">
      <input type="checkbox"> Option
    </div>
    <div class="option">
      <input type="checkbox"> Option
    </div>
    <div class="option">
      <input type="checkbox"> Option
    </div>
    <div class="option">
      <input type="checkbox"> Option
    </div>
    <div class="option">
      <input type="checkbox"> Option
    </div>
    <div class="option">
      <input...

CSS

.container {
  height: 150px;
  width: 300px;
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  border: 1px solid #000;
  padding: 4px;
}

.options {
  display: flex;
  flex-direction: row;
  flex-wrap: wrap;
}

.spacer {
  flex: 1 1 auto;
}

.buttons {
  display: flex;
  flex-direction: row;
  justify-content: space-between;
}